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plugin-Chapter 2 Students - Samples, Good and Bad CHAPTER 2...

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CHAPTER 2 Samples, Good and Bad
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WHEN LIFE GIVES YOU LEMONS… Suppose that I sell your company several crates of lemons every week. You examine a sample of lemons from each crate to determine the quality. It is easy to inspect a few lemons from the top of each crate, but those lemons may not represent the quality of the entire crate. If you sample from the top, your sample results are going to be biased.
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HOW TO SAMPLE BADLY Unfortunately, bad sampling methods are common and are passed off as scientific studies. Convenience sampling is the selection of whichever individuals are easiest to reach. A voluntary response sample chooses itself by responding to a general appeal. These sampling methods are often biased. A sampling method is biased if it systematically favors certain outcomes.
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Ann Landers once asked readers of her advice column, “If you had it to do over again, would you have children?” She received nearly 10,000 responses, almost 70% saying “NO!” Can it be true that 70% of parents regret having children? Discuss why this sample is almost certainly biased. Do you think the real percentage of parents who
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This note was uploaded on 08/05/2011 for the course STA 200 taught by Professor Wierdhobbitguy during the Summer '08 term at Kentucky.

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plugin-Chapter 2 Students - Samples, Good and Bad CHAPTER 2...

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